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Modification of the escape vent of the pot for spiny rock lobster (Panulirushomarous) in terms of position and size, (Sistan&BalouchestanProvince _ IRAN)
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Ashkan Azhdehakosh pour   , Amirhoshangh Mojri , Touraj Valinasab , Mohammad taghi Azhir , Aria Vazirzadeh , Seyed Mohammad hosein Hoseni aghozbeni , Mohebali Sistani , Abolhasan Rastiannasab |
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Abstract: (6886 Views) |
| This investigation was conducted in order to standardize (to modify) the pot size for spiny rock lobster, Panulirushomarous by designing appropriate escape vents in terms of position and size to allow the escape of immature lobsters (CL≤70 mm). The lobsters were examined by comparing experiment in four kind of trap with common fisherman trap as control. A location of study was laboratory-based utilizing concrete flow-through sea-water "raceway" tanks. Carapace lengths (CL), Width (CW) of Lobsters that use in the research were 56 ±5.13 and 45.8 ± 4.93 mm respectively. The Lobsters were grouped according to 5 mm CL classes for a range of 45–70 mm by placing 2 lobsters of each size class range in the pot. Each pot was monitored in the experimental tank or sea for 24 h soak time to measure the number of lobsters escaping and remaining inside. Result of ANOVA analysis indicated that the escape characteristics of each treatment trap type were significantly different from the control traps (p≤0.05). Comparative average escapement between the treatments and the control showed significantly differences. Observations in comparing the average percent escapement between treatment 4 with T3 and T2 were not significant (P≥0.05). Relationship between carapace length (CL) and carapace width (CW) of lobsters used in this research was indicated that, 71 mm escapement vet is superior. As we expected, result of this research indicated that increasing the vent size, decrease vent height and position of vent that was close to the bottom of trap were more effective to escapement of sub- legal lobsters and to decrease the retention in trap. As a result of this research,for lobsters with 70 mm carapace length, as legal size, the best choice is treatment 3 with 71 mm escape vent. Also the vents located at the bottom of trap were better than the other types. |
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| Keywords: Spiny Lobster, Escape vent, Panulirushomarus, Carapace length, Pot, Oman Sea, Sistan&Balouchestan province. |
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Full-Text [PDF 650 kb]
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Type of Study: Research |
Subject:
Special
Received: 2014/01/20 | Accepted: 2014/01/20 | Published: 2014/01/20
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